------------[ cut here ]------------
BTRFS: Transaction aborted (error -28)
WARNING: fs/btrfs/block-group.c:4012 at do_chunk_alloc fs/btrfs/block-group.c:4012 [inline], CPU#0: kworker/u4:29/4578
WARNING: fs/btrfs/block-group.c:4012 at btrfs_chunk_alloc+0x101d/0x15d0 fs/btrfs/block-group.c:4253, CPU#0: kworker/u4:29/4578
Modules linked in:
CPU: 0 UID: 0 PID: 4578 Comm: kworker/u4:29 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
RIP: 0010:do_chunk_alloc fs/btrfs/block-group.c:4012 [inline]
RIP: 0010:btrfs_chunk_alloc+0x101f/0x15d0 fs/btrfs/block-group.c:4253
Code: 67 85 c9 fd e9 6d 01 00 00 e8 8d 7c af fd 84 c0 74 22 e8 54 85 c9 fd e9 5a 01 00 00 e8 4a 85 c9 fd 48 8d 3d 93 1b 94 0b 89 de <67> 48 0f b9 3a e9 b3 fc ff ff e8 82 16 64 07 41 89 c6 31 ff 89 c6
RSP: 0018:ffffc90020dbf730 EFLAGS: 00010293
RAX: ffffffff83f77fd6 RBX: ffffffffffffffe4 RCX: ffff888033a58000
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffffffff8f8b9b70
RBP: 0000000000000000 R08: ffff888033a58000 R09: 0000000000000003
R10: 00000000fffffffb R11: 0000000000000000 R12: 1ffff11002215616
R13: ffff88804802f3d8 R14: ffff888040c14001 R15: ffff88803577a000
FS:  0000000000000000(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd4b895260 CR3: 000000004296c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 flush_space+0x355/0xd20 fs/btrfs/space-info.c:894
 do_async_reclaim_metadata_space+0x11e/0x350 fs/btrfs/space-info.c:1185
 btrfs_async_reclaim_metadata_space+0x89/0xe0 fs/btrfs/space-info.c:1252
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
----------------
Code disassembly (best guess):
   0:	67 85 c9             	addr32 test %ecx,%ecx
   3:	fd                   	std
   4:	e9 6d 01 00 00       	jmp    0x176
   9:	e8 8d 7c af fd       	call   0xfdaf7c9b
   e:	84 c0                	test   %al,%al
  10:	74 22                	je     0x34
  12:	e8 54 85 c9 fd       	call   0xfdc9856b
  17:	e9 5a 01 00 00       	jmp    0x176
  1c:	e8 4a 85 c9 fd       	call   0xfdc9856b
  21:	48 8d 3d 93 1b 94 0b 	lea    0xb941b93(%rip),%rdi        # 0xb941bbb
  28:	89 de                	mov    %ebx,%esi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 b3 fc ff ff       	jmp    0xfffffce7
  34:	e8 82 16 64 07       	call   0x76416bb
  39:	41 89 c6             	mov    %eax,%r14d
  3c:	31 ff                	xor    %edi,%edi
  3e:	89 c6                	mov    %eax,%esi